The Hot Potatoes suite includes six applications, enabling you to create interactive multiple-choice, short-answer, jumbled-sentence, crossword, matching/ordering and gap-fill exercises for the World Wide Web. Hot Potatoes is not freeware, but it is free of charge for those working for publicly-funded non-profit-making educational institutions, who make their pages available on the web. Other users must pay for a licence.

GNU Image Manipulation Program, or GIMP, is a raster graphics editor used to create and process digital graphics and photographs.

a free image viewer program that can  be used to view, edit, and convert image files.

An open source alternative to Skype.
Includes built in ability to record calls.

The most popular telephony program.
Computer to computer calling is free. Computer to phone is relatively low priced. Also supports text messaging, video calls,and file transfer.